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"New York, Oct 5 : After facing global flak over its users' mood study, the social networking site Facebook has given researchers clear guidelines for further research. 'If proposed work is focused on studying particular groups or populations (such as people of a certain age) or if it relates to c.."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.ap7am.com/english-news-2329-facebook-alters-research-guidelines.html>